Fix python testing script to work with MKL

For this, dlopen needs to share symbols globally because MKL internally
uses dynamic loading that doesn't work otherwise.

Makefile.am

@@ -630,18 +630,19 @@ python/pyelpa/wrapper.c: python/pyelpa/wrapper.pyx
 	cython $<
 
 if WITH_PYTHON_TESTS
-check_SCRIPTS += check_python.sh
+check_SCRIPTS += test_python.sh
 endif
 
-check_python.sh:
-	@echo "#!/bin/bash" > $@
-	@echo "export PYTHONPATH=$$PYTHONPATH:$(top_srcdir)/python" >> $@
+test_python.sh:
+	@echo '#!/bin/bash' > $@
+	@echo 'export PYTHONPATH=$$PYTHONPATH:$(top_srcdir)/python' >> $@
 # this is very hacky... is there a better way to get wrapper.so?
-	@echo "cp .libs/wrapper.so $(top_srcdir)/python/pyelpa" >> $@
-	@echo "pytest $(top_srcdir)/python" >> $@
-	@echo "exit_code=$$?" >> $@
-	@echo "rm $(top_srcdir)/python/pyelpa/wrapper.so" >> $@
-	@echo "exit $$exit_code" >> $@
+	@echo 'cp .libs/wrapper.so $(top_srcdir)/python/pyelpa' >> $@
+# the dlopen flags are needed for MKL to work properly...
+	@echo "python -c 'import sys, os; sys.setdlopenflags(os.RTLD_NOW | os.RTLD_GLOBAL); import pytest; pytest.main([\"$(top_srcdir)/python\"])'" >> $@
+	@echo 'exit_code=$$?' >> $@
+	@echo 'rm $(top_srcdir)/python/pyelpa/wrapper.so' >> $@
+	@echo 'exit $$exit_code' >> $@
 	@chmod +x $@
 
 # test scripts